Acceptance tests framework: Allow tests to change Gerrit configuration

Tests may want to contribute to the Gerrit configuration. Each method in
the test class should be able to add or override one or more parameters
of the Gerrit server configuration.

  public class UseGerritConfigAnnotationTest extends AbstractDaemonTest {

    @Inject
    @GerritServerConfig
    Config serverConfig;

    @Test
    @GerritConfig(name="x.y", value="z")
    public void testOne() {
      assertEquals("z", serverConfig.getString("x", null, "y"));
    }

    @Test
    @GerritConfigs({
        @GerritConfig(name="x.y", value="z"),
        @GerritConfig(name="a.b", value="c"),
    })
    public void testMultiple() {
      assertEquals("z", serverConfig.getString("x", null, "y"));
      assertEquals("c", serverConfig.getString("a", null, "b"));
    }
  }

Change-Id: I506d9f86280f1b067d2083cb33726009ed72c218

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/ConfigAnnotationParser.java

@@ -0,0 +1,58 @@
+// Copyright (C) 2013 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance;
+
+import com.google.common.base.Splitter;
+import com.google.common.collect.Lists;
+
+import org.eclipse.jgit.lib.Config;
+
+import java.util.ArrayList;
+
+class ConfigAnnotationParser {
+
+  private static Splitter splitter = Splitter.on(".").trimResults();
+
+  static Config parse(GerritConfigs annotation) {
+    if (annotation == null) {
+      return null;
+    }
+
+    Config cfg = new Config();
+    for (GerritConfig c : annotation.value()) {
+      parse(cfg, c);
+    }
+    return cfg;
+  }
+
+  static Config parse(GerritConfig annotation) {
+    Config cfg = new Config();
+    parse(cfg, annotation);
+    return cfg;
+  }
+
+  static private void parse(Config cfg, GerritConfig c) {
+    ArrayList<String> l = Lists.newArrayList(splitter.split(c.name()));
+    if (l.size() == 2) {
+      cfg.setString(l.get(0), null, l.get(1), c.value());
+    } else if (l.size() == 3) {
+      cfg.setString(l.get(0), l.get(1), l.get(2), c.value());
+    } else {
+      throw new IllegalArgumentException(
+          "GerritConfig.name must be of the format"
+              + " section.subsection.name or section.name");
+    }
+  }
+}